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IS 466: Identification and systematical studies of the electron-capture delayed fission (ECDF) in the lead region Part I: ECDF of 178,180 Tl IS 456: Study of polonium isotopes ground state properties by simultaneous atomic- and nuclear-spectroscopy ISOLDE Proposal: Shape coexistence in the lightest Tl isotopes studied by laser spectroscopy PhysicsWorld.com IOP site ScienceNews Scientific American NatureNews

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180 Tl A new ECDF branching ratio of P ECDF =3,6(7)·10 -5 was deduced for the parent nucleus 180 Tl, which is much higher and much more precise than the previously estimated value of P ECDF ~10 -(7±1) (Dubna, 1992).

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For symmetrical split in two semi-magic nuclei was expected before the experiment. In low-energy fission (including β- or EC-delayed fission) for nuclei from Fm to U asymmetric fission dominate over symmetric fission due to influence of doubly magic 132 Sn. Below Th (Th, At) only symmetric fission has been found.

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The increasing softness of the deformation energy surfaces, when going down from 210 Po to 194 Po, leads to collective ground-state wave functions of increasing spread over oblate, prolate and spherical shapes. For 192,190 Po, the ground-state wave function becomes centered around an oblate minimum in the deformation energy surface.